I'm American, and all but aren't riots/strikes etc examples of how France's political life enjoys a much higher per-capita rate of material participation than USAns are accustomed to seeing?
More generally, France is notorious for being suspicious of foreign influences (international Communism, globalization, Islamism -- heck, even Catholicism, though most of them still practice it at least nominally.)
Terrorism... I dunno, terrorists in small groups tend to blow up or gun down people unexpectedly, whereas these protestors in large groups don't generally try to kill or to hide.
https://en.wikipedia.org/?title=Ku_Klux_Klan#Later_Klans:_19...
Much like the current situation in France, the police were generally complicit and did very little about the terrorists.